Black Ink Composition, Ink Set Containing the Same, and Ink Jek Recording Method

a technology of black ink and composition, which is applied in the direction of inks, coatings, instruments, etc., can solve the problems of not achieving satisfactory black tonality, problems with color tonality adjusting ability, and affecting the quality of black ink, etc., to achieve good black tonality, high printing density, and high fastness to light

Inactive Publication Date: 2008-02-21
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] An object of an illustrative, non-limiting embodiment of the present invention is to provide a black ink composition containing a water-soluble short-wavelength dye S and a water-soluble long-wavelength dye L, which does not require a large amount to be added and other color correcting dyes, can achieve excellent black tonality and high-density printing, has excellent weather resistance, heat resistance, water resistance (no bleeding), hue, and solution stability; an ink set comprising the same; and an inkjet recording method using the same. First Embodiment
[0072] By using the black ink composition of the present invention in inkjet recording, it is possible to form an image which has good black tonality, high printing density, and high fastness to light and active gas in the environment. In addition, bleeding in an image during preservation under high temperature and high humidity can be significantly reduced.

Problems solved by technology

However, it is considerably difficult to find a coloring agent meeting these criteria to a high extent.
When only these dyes are used, blue to green light are insufficiently absorbed, so that it is often that satisfactory black tonality is not obtained.
However, the color correcting dye proposed in the related art has problems with the color tonality adjusting ability.
Dyes capable of absorbing blue to green light are generally known, however, most of them have poor fastness, so that their hue may be significantly altered by exposure to light, heat, or active gas in the environment; and insufficient fixing ability, so that yellow bleeding appears at a contour portion under high temperature and high humidity conditions, for example.
H08-302255 describes CI Direct Red 84. However, the publication does not disclose a black ink composition in which CI Direct Red 84 is used as a short-wavelength dye in combination with a long-wavelength dye.
Similarly, however, the publication does not disclose a black ink composition in which CI Direct Red 84 is used as a short-wavelength dye in combination with a long-wavelength dye.

Method used

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  • Black Ink Composition, Ink Set Containing the Same, and Ink Jek Recording Method
  • Black Ink Composition, Ink Set Containing the Same, and Ink Jek Recording Method
  • Black Ink Composition, Ink Set Containing the Same, and Ink Jek Recording Method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0357] Ultrapure water (resistance value: 18 MΩ or more) was added to ingredients described below to a volume of one liter. Thereafter, the mixture was stirred for one hour while heating at 30 to 40° C. Thereafter, the mixture was subjected to filtration under reduced pressure using a microfilter having an average pore of 0.25 μm. Thereby, an ink solution was prepared for each color. Note that concentrations of the ingredients below are those after preparation (the same is true of other prescriptions below).

(Formula of light cyan ink solution)(Solid ingredients)cyan dye (C-1)20 g / lurea (UR)15 g / lbenzotiazole (BTZ)0.08 g / lPROXEL XL2 (PXL) (manufactured by Avecia)3.5 g / l(Liquid ingredients)triethylene glycol (TEG)110 g / lglycerin (GR)130 g / ltriethylene glycol monobutyl ether (TGB)110 g / l2-pyrrolidone (PRD)60 g / ltriethanolamine (TEA)7 g / lSURFYNOL STG (SW) (manufactured by Air Products)10 g / l(Formula of cyan ink)(Solid ingredients)cyan dye (C-1)60 g / lurea (UR)30 g / lbenzotiazole (BTZ)0....

example 2

[0381] Ink sets IS-201 to 210 were prepared which contains a black ink similar to that of Example 1, except that the long-wavelength dye L and the short-wavelength dye S used in preparation of the black ink of Example 1 were changed to dyes shown in Table 5. In addition to a Na salt of 1-19, other long-wavelength dyes L of the present invention also satisfied the λmax and half-band width conditions of the present invention.

[0382] Note that the viscosity and surface tension of the black ink are shown in Table 5.

[0383] The results of evaluation which was carried out in a manner similar to that of Example 1 are shown in Table 6.

TABLE 5Black inkLong-wavelengthShort-wavelength dye SSurfacedye LNumber of azoViscositytensionDye typeg / lDye typeg / lgroups / moleculeNaphthalene skeleton(mPa · s)(mN / m)IS-201 (Invention)Li salt of 1-1960Na salt of 2154Yes5.133.5IS-202 (Invention)Li salt of 1-1560Na salt of 2154Yes5.033.2IS-203 (Invention)Li salt of 1-1660Na salt of 2154Yes5.433.6IS-204 (Invent...

example 3

[0386] Ultrapure water (resistance value: 18 MΩ or more) was added to ingredients described below to a volume of one liter. Thereafter, the mixture was stirred for one hour while heating at 30 to 40° C. Thereafter, the mixture was subjected to filtration under reduced pressure using a microfilter having an average pore of 0.25 μm. Thereby, an ink solution was prepared for each color.

(Formula of light cyan ink solution)(Solid ingredients)cyan dye (C-1)10g / lurea (UR)15g / lbenzotiazole (BTZ)0.08g / lPROXEL XL2 (PXL) (manufactured by Avecia Limited)3.5g / l(Liquid ingredients)triethylene glycol (TEG)50g / lglycerin (GR)100g / ltriethylene glycol monobutyl ether (TGB)60g / l1,5-pentanediol (PTD)40g / lisopropanol (IPA)20g / ltriethanolamine (TEA)7g / lSURFYNOL STG (SW) (manufactured by Air Products)10g / l(Formula of cyan ink)(Solid ingredients)cyan dye (C-1)30g / lurea (UR)40g / lbenzotiazole (BTZ)0.08g / lPROXEL XL2 (PXL) (manufactured by Avecia)3.5g / l(Liquid ingredients)triethylene glycol (TEG)40g / lglycerin...

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Abstract

Black ink compositions are provided. First embodiment contains a water-soluble long-wavelength dye L and a water-soluble short-wavelength dye S, in which the water-soluble short-wavelength dye S has 3 or more azo groups per molecule and a naphthalene skeleton. Second embodiment contains a water-soluble short-wavelength dye S whose absorption spectrum in aqueous solvent has a maximum between 440 nm and 540 nm and a half-band width of 90 to 200 nm and a water-soluble long-wavelength dye L whose absorption spectrum in aqueous solvent has a maximum between 550 nm and 700 nm and a half-band width of 100 nm or more. Third embodiment contains water, a water-miscible organic solvent, and a coloring material, in which C. I. Direct Red 84 is contained as a water-soluble short-wavelength dye S.

Description

TECHNICAL FIELD [0001] The present invention relates to a black ink composition comprising an azo dye having a particular structure and property (preferably, an image forming black ink composition (preferably, an inkjet ink composition)), an ink set comprising the same, and an inkjet recording method employing the black ink composition or the ink set. BACKGROUND ART [0002] An inkjet recording method has been spreading rapidly and is still being improved because of inexpensive material cost, high-speed recording, less noise during recording, and easy implementation of color recording. [0003] The inkjet recording method includes: a continuous method which causes a droplet to continuously travel by air; and an on-demand method which causes a droplet to travel by air, depending on an image information signal. The droplet is ejected by using a pressure using a piezo element; by generation of bubbles in ink by heating; by using ultrasonic wave; or by suctioning with electrostatic force. [...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D11/00B41J2/01
CPCC09D11/40C09D11/328C09D1/00
Inventor IKEDA, KENJITANAKA, TOSHIHARU
Owner FUJIFILM CORP
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